Threshold setting device for setting threshold used in binarization process, object detection device, threshold setting method, and computer readable storage medium

摘要

A threshold setting device, an object detection device, a threshold setting method, and a computer readable storage medium are shown. According to one implementation, the threshold setting device includes, an image acquisition unit, a ratio acquisition unit, and a setting unit. The image acquisition unit acquires an image including a specific object. The ratio acquisition unit acquires ratio information related to a ratio of a plurality of colors present in the specific object. The setting unit sets, based on the ratio information acquired by the ratio acquisition unit, a threshold used in a binarization process performed on the image including the specific object acquired by the image acquisition unit.

主权项

1. A threshold setting device comprising:
an image acquisition unit which acquires an image including a specific object; a ratio acquisition unit which acquires ratio information related to a ratio of a plurality of colors present in the specific object; and a setting unit which sets, based on the ratio information acquired by the ratio acquisition unit, a threshold used in a binarization process performed on the image including the specific object acquired by the image acquisition unit, wherein pixel values of the image including the specific object are separated into two classes by a temporary threshold, and wherein the setting unit (i) calculates, for a plurality of the temporary thresholds, an evaluation value by weighting with a larger weight a degree of separation between the two classes separated by the temporary threshold, as a ratio of a pixel number of the two classes approaches the ratio of the plurality of colors indicated in the ratio information, and (ii) sets, from among the plurality of the temporary thresholds, a temporary threshold with a largest calculated evaluation value as the threshold used in the binarization process.